Samsung galaxy tab s 8.4 SM-T705 CSC changing

[msk22]

Hello guys...
I have a samsung galaxy tab s 8.4 wich brought from Hong Kong
But currently im living in Sri Lanka.
My tab's CSC code is TGY (Hong Kong) and i want to change it to SLK (Sri Lanka)
Because this firmware does not support my local language and keyboard.
Can anyone tell me how to change my firmware without tripping knox count?
and if I do can I still able to receive OTA update?

[sonnyx]

Ok thanks for your suggestion i'll try it